Mammoth 2 to 6 Tons: High Efficiency, Superior IAQ Single Circuit Vertical (B-Vintage) - Manual (Page 10)

10
MAMM-WSHP-IOM-1BA (February 2012)
1. Open all valves to full open position and turn on
power to the heat pump.
2. Set room temperature sensor for “Fan Only” opera-
tion by selecting “Off” at the system switch and
“On” at the fan switch. If “Auto” fan operation is se-
lected, the fan will cycle with the compressor.
Check for proper air delivery.
3. Units have time delays which help protect the com-
pressor(s) against short cycling. In the cooling
mode, after 30 seconds of operation, check the
discharge grilles for cool air delivery. Measure the
temperature difference between entering and leav-
ing water. It should be approximately 1 ½ times
greater than the heating mode temperature differ-
ence.
4. In the heating mode, measure the temperature dif-
ference between entering and leaving air and en-
tering and leaving water. With entering water of 60°
F to 80°F, leaving water should be 6°F to 12°F
cooler, and the air temperature rise through B-
Vintage vertical units should not exceed 35°F. If
the leaving air temperature falls below 35°F, adjust
water flow to the unit to >3 gpm/ton to avoid freeze
damage to the unit.
Start-up
5. Fill the p-trap with water to ensure that negative
pressure does not pull drain gases into the unit.
6. Check the elevation and cleanliness of the conden-
sate line. If the air is too dry for sufficient dehumidi-
fication, slowly pour enough water into the conden-
sate pan to ensure proper drainage.
7. If the unit does not operate, check the following
points:
a) Is supply voltage to the unit compatible?
b) If the unit operates but stops after a brief period:
i) Is there proper airflow? Check for dirty filter,
incorrect fan rotation or incorrect ductwork.
ii) Is there proper water flow rate within tem-
perature limits? Check water balancing; back-
flush unit if dirt clogged.
iii) See troubleshooting guide on page 21 for
more tips.